Gratitude is not only the greatest of virtues, but the parent of all the others.

- Cicero -

Marcus Tullius Cicero (106–43 BC) was a Roman orator, lawyer and statesman, and one of the most influential writers of Latin. Alongside his speeches he wrote philosophical treatises that carried Greek thought into Latin — among them On Friendship, written after the death of his closest friend. He was killed in the political violence following Caesar's death.

About this theme: Happiness

Few subjects have been written about so much with so little agreement. For Aristotle happiness was not a feeling but a way of living — eudaimonia, visible only when a life is viewed whole. For the Epicureans it was the absence of disturbance. For the Stoics it was a consequence of virtue and never a target. None of these is the same as being in a good mood, yet that substitution is the one most often made.

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